07 December 2015 Hidden symmetry and protection of Dirac points on the honeycomb lattice Jing-Min Hou1 & Wei Chen2 The honeycomb lattice possesses a novel energy band structure, which is characterized by two distinct Dirac points in the Brillouin zone, dominating most of the physical properti...
Phase separation is accompanied by spectral weight loss and first Brillouin zone boundary deformation. Such an instability is observed in square structures and it is absent in honeycomb lattices. To our knowledge, no previous publications have revealed relationship between a Fermi surface instability and...
The honeycomb lattice possesses a novel energy band structure, which is characterized by two distinct Dirac points in the Brillouin zone, dominating most of the physical properties of the honeycomb structure materials. However, up till now, the origin of the Dirac points is unclear yet. Here, we...
Gray lines indicate high symmetry directions of the Brillouin zone. Wave vector transfers are shown in the reciprocal space of the monoclinic lattice in reciprocal lattice units for (a)–(g) and projected into a hexagonal lattice in (h)–(i). Data in (a)–(c) and (g) have been ...
Lattice Wigner crystal states stabilized by long-range Coulomb interactions have recently been realized in two-dimensional moiré materials. We employ large-scale unrestricted Hartree-Fock techniques to unveil the magnetic phase diagrams of honeycomb lat
The exact diagonalization results were produced using the library ARPACK49, primarily on an N = 24 site cluster with the full point group symmetry of the honeycomb lattice, and containing all the high-symmetry points of the Brillouin zone. Additional calculations were done on system sizes ran...
Our results include an intriguing field-evolution of the regions of the Brillouin zone wherein decays of spin excitations are prominent, a detailed classification of the decay channels involving magnons from both excitation branches, and a thorough analysis of the singularities in the magnon spectra ...
point and dinouebnleergDyirsaacmceonasesthaopspeealirst[esdeeinFiEg.q 2. ((d3))].,Fwohr itc1h =a tr0e, the d and p bands become equivalent to the ones at K and K′ points in the unfolded Brillouin zone of honeycomb lattice with the rhombic unit cell of two ...
Fig. 2. (a) The honeycomb lattice structure of graphene with two atoms, A and B, per unit cell. a1 and a2 are the lattice vectors and a = 1.42 Å is the in-plane nearest-neighbor distance. (b) Brillouin zone of graphene with representation of Dirac cones near the K and K’ poin...
(a) Zig-zag nanoribbon from a 2D heteronuclear honeycomb lattice (in this case, boron nitride with unsaturated edges), where the 'interface' is with vacuum (i.e., an insulator with vanishing polarization). (b) Selective covalent functionalization (for example, with hydrogen) of a parent ...